Seribulan, Muhamad Nurdin Matondang, Sri Rahayu, and Hanum Isfaeni. 2018. “Developing a Web-Based Learning (E-Learning) in General Biology Subjects With Joomla Program”. Biosfer: Jurnal Pendidikan Biologi 7 (1):1-9. https://doi.org/10.21009/biosferjpb.7-1.1.